... span life 20 years; Lead Acid Gel battery, span life for 4 years; Mono Solar panel, power efficiency 17%; LED streetlamp, ... a functional natural energy illumination, but also a beautiful scene for streetlight. The following is an Economic Benefit Comparison: Bitmap INTEGRATED ... 905,823.60400W(High pressure sodium lamp)4161.76647.04controller for wind solar hybrid system4291.201,164.80pole 10m4970.593, ...